diff --git a/libcxx/test/support/test_comparisons.h b/libcxx/test/support/test_comparisons.h
--- a/libcxx/test/support/test_comparisons.h
+++ b/libcxx/test/support/test_comparisons.h
@@ -30,7 +30,7 @@
 
 //  Test all six comparison operations for sanity
 template <class T, class U = T>
-TEST_CONSTEXPR_CXX14 bool testComparisons(const T& t1, const U& t2, bool isEqual, bool isLess)
+_LIBCPP_NODISCARD TEST_CONSTEXPR_CXX14 bool testComparisons(const T& t1, const U& t2, bool isEqual, bool isLess)
 {
     assert(!(isEqual && isLess) && "isEqual and isLess cannot be both true");
     if (isEqual)
@@ -84,7 +84,7 @@
 
 //  Easy call when you can init from something already comparable.
 template <class T, class Param>
-TEST_CONSTEXPR_CXX14 bool testComparisonsValues(Param val1, Param val2)
+_LIBCPP_NODISCARD TEST_CONSTEXPR_CXX14 bool testComparisonsValues(Param val1, Param val2)
 {
     const bool isEqual = val1 == val2;
     const bool isLess  = val1  < val2;
@@ -137,7 +137,7 @@
 }
 
 template <class Order, class T, class U = T>
-constexpr bool testOrder(const T& t1, const U& t2, Order order) {
+_LIBCPP_NODISCARD constexpr bool testOrder(const T& t1, const U& t2, Order order) {
     bool equal = order == Order::equivalent;
     if constexpr (std::same_as<Order, std::strong_ordering>)
         equal |= order == Order::equal;
@@ -148,7 +148,7 @@
 }
 
 template <class T, class Param>
-constexpr bool testOrderValues(Param val1, Param val2) {
+_LIBCPP_NODISCARD constexpr bool testOrderValues(Param val1, Param val2) {
   return testOrder(T(val1), T(val2), val1 <=> val2);
 }
 
@@ -156,7 +156,7 @@
 
 //  Test all two comparison operations for sanity
 template <class T, class U = T>
-TEST_CONSTEXPR_CXX14 bool testEquality(const T& t1, const U& t2, bool isEqual)
+_LIBCPP_NODISCARD TEST_CONSTEXPR_CXX14 bool testEquality(const T& t1, const U& t2, bool isEqual)
 {
     if (isEqual)
         {
@@ -178,7 +178,7 @@
 
 //  Easy call when you can init from something already comparable.
 template <class T, class Param>
-TEST_CONSTEXPR_CXX14 bool testEqualityValues(Param val1, Param val2)
+_LIBCPP_NODISCARD TEST_CONSTEXPR_CXX14 bool testEqualityValues(Param val1, Param val2)
 {
     const bool isEqual = val1 == val2;